AP1601

STEP-UP DC/DC CONVERTER

AP1601 Rev. 5

1 of 12

SEPTEMBER 2009

www.diodes.com

•

A Guaranteed Start-Up from less than 0.9 V.

•

High Efficiency.

•

Low Quiescent Current.

•

Less Number of External Components needed.

•

Low Ripple and Low Noise.

•

Space Saving Packages: MSOP-8L and MSOP-10L.

•

MSOP-8L and MSOP-10L: Available in “Green”

Molding Compound (No Br, Sb)

•

Lead Free Finish / RoHS Compliant (Note 1)

The AP1601 is a high efficiency step-up DC/DC converter for

applications using 1 to 4 NiMH battery cells. Only three external

components are required to deliver a fixed output voltage of 3.3V

or 5V. The AP1601 starts up from less than 0.9V input with 1mA

load. Pulse Frequency Modulation scheme brings optimized

performance for applications with light output loading and low

input voltages. The output ripple and noise are lower compared

with the circuits operating in PSM mode.

The PFM control circuit operating in 100KHz (max.) switching

rate results in smaller passive components. The space saving

MSOP packages make the AP1601 an ideal choice of DC/DC

converter

for

space

conscious

applications,

like

pagers,

electronic cameras, and wireless microphones.

•

Pagers

•

Cameras

•

Wireless Microphones

•

Pocket Organizers

•

Battery Backup Suppliers

•

Portable Instruments

Typical Application Circuit

SHDN

LBO

LX

OUT

FB

REF

LBI

GND

0.1uF

Low- Battery

Detect OUT

22uH

220uF

+

100uF

+

V

IN

ON

OFF

Adj Output (1.8V to 4.0V)

up to 300 mA

Low- Battery

Detect In

R5

R6

Vout=1.2 (1+

)

R6

R5

R6 Suggest 100K~200K

FB=Vout, Vout=3.3V

FB=GND, Vout=5V

×

Features

General Description

Applications